We need every moment of Advent to grow in faith. It is so easy to miss Christ's Christmas coming. Only those who are filled with faith will be ready to meet Him.
Joseph, the man of faith, believed an angel's message, which he heard in a dream (Mt 1:20). He believed that his wife was pregnant by the power of the Holy Spirit. This was one of the most astounding acts of faith ever. St. Joseph, pray for us to grow deeply and quickly in faith during these last days of Advent.
In the first reading of today's Mass, the Church presents to us a prophecy from Jeremiah referring to the Exodus and to the Israelites' return from exile in Babylon (Jer 23:7-8). Both of these monumental events came out of nowhere. To believe that they would ever occur would be to "walk by faith, not by sight" (2 Cor 5:7).
Several mountains loom between us and meeting Christ this Christmas. Only by faith can we move these mountains (Mt 17:20). In these last few days of Advent, let us cry out: "I believe! Help my lack of faith!" (Mk 9:24, our transl) Let us abide in God's word (Jn 8:31) by which we hear Him and have faith in Him (Rm 10:17). Let us grow in faith, even if we have to suffer (see 1 Pt 1:6-7). When Advent is the time of our greatest faith, Christmas will be the greatest ever.